Planooraph co



E. L. FULLER.

DRAFTING APPARATUS.

APPLICATION msn ocT. la. |911.

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1MB COLUMBIA PLANoanAPN CO'.. V/Almnnl'btl. D. c.

E. L. FULLER.

DRAFTING APPARATUS.`

APPLICATION FILED ocr. la. :911.

1 ,3 14,323. Patented Aug. 26, 1919.

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BY f

ATTORNEY.

THB COLUMBIA VLANOGRAWI` C0" WASMINIITON. D. C.

UNITED sTATEs PATENT oEEIoE.

ERNEST LORIN FULLER, OF MALDEN, MASSACHUSETTS, ASSIGNOR TO TECHNICAL SUPPLY COMPANY, OF SCRANTON, PENNSYLVANIA, A CORPORATION 0F NEW JERSEY.

DRAFTING APPARATUS.

Application filed October 13, 1917.

To all fr0/0m z't may conce/WL:

Be it known that I, ERNEST L. I1`ULLER, a citizen of the United States, residing at Malden, inv the county of Middlesex and State of lVlassachusetts, have invented certain new and useful Improvements in Drafting Apparatus, of which the following is a specification.

My invention relates to improvements in drafting apparatus.

One of the'objects of my invention is to provide a drafting apparatus comprising a straight-edge provided with a parallel motion attachment attached to the straightedge and to a drawing-board, table, or any flat surface which will permit the straightedge to be freely moved and t0 be maintained constantly in an absolutely parallel position with respect to the angle at which it is placed, when moved over the surface of the drawing-board.

Another object is to provide an attachment for a straight-edge, which will allow the straight-edge to be readily and quickly adjusted to any angle desired or its angle changed without re-adjustmcnt or change of position of the moving parts or the cords.

Another object is to provide means for llocking and holding a straight-edge at a fixed angle, after it has been placed at the particular angle desired, so that while the angle of the straight-edge cannot be changed without unlocking it, the straight-edge, nevertheless, may he simultaneously moved over the surface of the drawing-board and the same angle will be constantly and accurately maintained while it is locked at that angle.

Another object is to provide a parallel motion attachment which may be readily attached to any straight-edge, drawingboard or any flat surface.

Another objectl is to provide a parallel motion attachment in which all the wheels are incased, so that the attachment cannot become unstrung, notwithstanding how quickly the straight-'edge is moved or its position changed.

Another' object is to provide a parallel motion attachment which will allow full play to the straight-edge for continuous drawing, either horizontally or vertically, clear across the drawing-board.

In attachments for allowing parallel motion of a straight-edge in general use there Specification of Letters Patent.

Patented Auw. 26, 1919.

Serial No. 196,456.

is no means for permitting the angle of the straight-edge to be changed to any great extent without either practically taking the attachlnent apart and completely readjusting the cords and their cooperating parts, or releasing some operative part, while in my device none of the moving parts or the cords have to be readj listed, except a thumbnut and the coperating parts, in order to change the angle.

In the accompanying drawings, Figure 1 is a plan of a drawing-board and my improved drawing apparatus, comprising the straight-edge and parallel motion attachment for the same. Fig. 2 is a diagrammatic view showing the course of the cords. Fig. 3 is a plan of one of the end casings. Fig. 4 is a front elevation of one of the end casings. Fig. 5 is a plan of the center casing showing the cords in dotted outline. Fig. 6 is a central longitudinal section of the center' casing on the line w-m, Fig. 5. Fig. 7 is a vertical cross section of the center casing on the line ,1f-jy, Fig. 5: Fig. 8 is a front elevation, Fig. 9, a side elevation and Fig. 10 a plan of one of the cord holders.

Latitude is allowed herein as to details, since they may be varied or changed at will without departing from the spirit or scope of my invention.

Corresponding and like parts are referred to in the following description and indicated in all the figures of the drawings by the same reference characters.

In the drawings, 1 represents a straightedge, on the upper side of which are mounted a center casing 2 and end casings 3 and 4 of metal and placed preferably adjacent t0 the lower edge of the straight-edge 1. The center casing 2 consists of a channel plate 5 fastened to the straight-edge 1 by screws 6 and having a longitudinal slot 7 extending its entire length, while the end casings 3 and 4l consist of two plates S and 9, each pair of which is held together by intervening tubular studs 10 riveted in the plates 8 and 9, and through the tubular studs 10 screws 11 are passed, which fasten the end casings 3 and 4i: to the straight-edge I, while posts 12 are located between the plates S and 9 near their outer end. In the center casing 2 is located a rectangular plate 13, adapted to engage the walls of the center casing 2, in which plate 13 is riveted a stud 14,'havin'g a threaded post- 15 extend-V studs l0 and in the same plane freely revolving double grooved wheels 17, 18, 19,20 and 21, around which cords 22 and 23 are adapted to pass, each` cord following one' and the same relative groove in each wheel as it passes from wheel to wheel, while the posts 12 serve to keep the cords 22 and 23 from becoming detached from the casings 3 and 4. By this arrangement the center casing` 2 covers the cords 22 and` 23 as they cross from one en d to the other of the straight-edge 1, which part of each cord 22 and 23 between'the end casings 3and 4 is t-he only part in motion, when the straight-edge 1 is being moved.

`The straight-edge 1, when mounted upon a drawingboard 24, or other flat surface,

after it has been placed at any desired angle with reference to a base line onV said board or support, is locked at that angle by tightening the thumb-nut 16, so that the lchannel plate 5 of the center casing 2 will be pressed down upon the top of the stud 14 leaving the wheel 19, which is not so high in elevationas the stud 14, to revolve freely, and Vthereby the channel plate 5 will be held in a fixed position as will be the straight-edge 1, which may` then be moved readil)7 over the drawing-board 24 and the same angle will be constantly maintained while the straight-edge 1 is locked at that angle. vUpon loosening the thumbni1t'16 the straight-edge 1 may be easily moved and placed at the angle desired; The wheels 17, 18, 19, 20 and-21 are preferably lnot in alinement as shown in the drawings in order to allow the cords 22 and 23 to pass freely by eachinner wheel 18 and 20 in the wheelsl'?, 18, 19, 20 and 21 may be reversed so as to follow the otherseries of relative grooves inthe wheels without affecting the operationof the apparatus, while separate single grooved wheels may be substituted for the double grooved wheels by using three wheels in each endV easing and two `wheels in the center casing and the same general method of Stringing the cords may be used.

When the parts of the attachment have been assembled and fas-tened to the straightedge 1 it is mounted on the drawing-board 24 or any flat surface, tothe edge of each corner of the top and bottom of which is attached a cord holder 25, 26, 27 and 28, each of which comprises a body portion 29 provided at its lower end with a prong 30, at

Vdrawing-board .24 on its top and bottom edges to permit the straight-edge 1 to be moved underneath the portions 31 clear up to thevbody portions 29 of the cord holders 25, 26, 27 and 28. `Therefore, the straightedge 1 is allowed to pass freely over practically the entire' surface of the drawing- Vboard 24, which 1s 'free of obstructions on the sides as well, while/full play is allowed across the drawing-board 24 for continuous drawing on paper passed across the `drawing-board 24, Yeither vertically or horizontal-ly, since there are no attachments or projections beyond the drawing-board 24 to makeit cumbersome or to interfere withfthe work of the draftsman.

In fastening the attachment to a straightedge or drawing-board one end `of the. cord 22 is secured to the cord holder 25, from which the cord is passed partly around the wheel 17, thence down toand partly around the wheel 18, wacross lthe straight-edge 1 to and around the wheel 20, back to and around the wheel. 19, thence up to and partly around the wheel 21 down to the cordholder 26, where the other end of the cord 22 is fastened. The other cord 23 is fastened by one end to the cord holder 27, whence the cord is passed partly around thewheel 21, thence up to and partly around the wheel 20, across the straight-edge 1 to andV around the wheel 18, bac-k to and `around the wheel l19, thence up to and partly aroundy the wheel 17 down to the cord holder 28, where The course of the cords 22 and 23- is shown in Figs. 2, 3 and 4, in which the course of cord 22 is indicated by short arrows and the course of cord 23 by long arrows. By employing this method of arranging the cords 22'and 23 and the coperating-wheels the straight-edge'may be moved easily and quickly to any desired angle, while the angle of the straight-edge may be readily changed, eitherslightly or radically, without adjusting or releasing the ends of the cords 22 and 23 or any of the parts, except the thumb-nut 16. The end of one of the cords 22 or 23 may be provided with a slip noose as in Fig. 1 at cord holder 27 in order to adjust the tension of the cords 22 and 23, so as 4to retain the straight-edge 1 in a rigid position.

In operation, when it is'desired/to place and lock the straight-'edge 1 at a certain angle or to change its angle theV thumb-nut 16 is loosened, when the straight-edge 1 may be easily moved and locked at that particular angle by tightening the thumb-nut 16. Then the straight-edge 1 may be readily moved over the surface of the drawingboard 24 and maintained constantly at the same angle wi-thout any further adjustment. In changing the angle of the straight-edgel 1 the whe-el 19 and cooperating parts slide through the center casing 2 and the threaded post 15 along the longitudinal slot 7 until the proper angle has been reached by the straight-edge 1, when they remain stationary and the tightening of the thumbnut 16 locks and maintains the straight-edge 1 at the angle in which it is locked as it is moved over the drawing-board 24. Furthermore, the straight-edge 1 may be readily moved to any position on the drawingboard 24 both before and after the straightedge 1 has been adjusted to the angle desired.

I claim as new and desire to secure by Letters Patente- 1. In a drafting apparatus, adapted to be secured on a support having a base line, a straight-edge, wheels attached thereto, cords passing around the said wheels, and means independent of the cords for locking and holding the said straight-edge at a fixed angle to said base line.

2. In a drafting apparatus, adapted to be secured on a support having a base line, a straight-edge, wheels attached thereto, cords passing around the said wheels, and means for simultaneously locking and holding the said straight-edge at a fixed angle to said base line and permitting the said straightedge to be readily moved and maintained constantly at the same angle.

3. In a drafting apparatus, adapted to be secured on a support having a base line, a straight-edge, wheels attached thereto, cords passing around the said wheels, means independent of the cords for locking and holding the said straight edge at a fixed angle to said base line, and means for altering the relation of one of said wheels with respect to the other of said wheels whereby the angle of the said straight-edge may be readily and quickly changed without any adjustment of the Said cords.

4. In a drafting apparatus, adapted to be secured on a support having a base line, a straight-edge, wheels attached thereto, cords passing around the said wheels, means for simultaneously locking and holding the said straight-edge at a fixed angle to said base line and permitting the said straight-edge to be readily moved and maintained constantly at the same angle, and means for altering the relation of one of said wheels with respect to the other of said wheels whereby the angle of the said straight-edge may be readily and quickly changed without any adjustment of the said cords.

5. In a drafting apparatus, adapted to be secured on a support having a base line, a straight-edge, wheels attached thereto, cords passing around the said wheels, means independent of the cords for locking` and hold` ing the said straight-edge at a fixed angle to said base line, and means for altering the position of one of said wheels on the straight edge relatively to the other wheels thereon to vary the angle of the straight edge, the said wheels beine' capable of revolving freely and the cor( s to move thereover while the said straight-edge is locked at the said angle. j

6. In a drafting apparatus, adapted to be secured on a support having a base line, a straight-edge, wheels attached thereto, cords passing around the said wheels, means for simultaneously locking and holding the said straight-edge at a fixed angle to said base line and permitting the said straight-edge to be readily moved and maintained constantly at the same angle, and means for altering the position of one of said wheels on the straight edge with respect to the other wheels thereon whereby the straight edge may be set at different angles, the said wheels being capable of revolving freely and the cords to move thereover while the said straight-edge is locked and niaintained at the said angle.

7. In a drafting apparatus, adapted to be secured on a support having a base line, a straight edge. casings attached to the ends of the straight edge and a center easing attached lto the portion of the straight edge between said end casings, wheels in the said casings, cords passing around the said wheels, and means cooperating with the said center casing for locking the said straight-edge at the desired angle to said base line. l

8. In a drafting apparatus, adapted to be secured on a support having a base line, a straight-edge, casings attached to the ends of the straight edge and a center casing attached to the portion of the straight edge between said end casings, wheels in the said casings, cords passing around the said wheels, means coperating with the said center casing for locking the said straight-edge at the desired angle, and means for causing the angle of the said straight-edge to said base line to be readily and quickly changed without any adjustment of the said cords.

9. In a drafting apparatus, adapted to be secured on a support having a base line, a straight-edge, casings attached to the ends of the stra-ight edge and a center casing attached to the portion of the straight edge between said end casings, wheels in the said casings, cords passing around the said wheels, and means coperating with the said center casing for locking the said straight- Y edge, the said wheels being capable ofrevolving freely and the cords being free to move thereover while thesaid straight-edge is locked at the said angle, Y Y .Y

10.*In a drafting apparatus, a straightedge, casings attachedvto the endsl of the straight edge and a center casing attached to the portion of the straight edge between said end casings, wheels 1n=the said casings, cords passing around the said wheels, means .for securing said, cords adjacent their.

said center casing, cords passing around the said wheels and means forsecuring said cords adjacent theirends to, a support.

12. In a drafting apparatus, astraightedge, a center casing attached to the straightedge intermediately of its ends and provided with a longitudinal slot, end casings Yattached to each end of the said straight-edge, grooved wheels mounted in the said end casings, a movable rectangularplate inthe saidcenter casing, a grooved wheel mounted on a stud in the'said plate and shorter in elevation than the-said stud, a threaded-post extending from the said stud through the slot in the said center casing and of smaller diameter than the Vsaid stud, a thumb-nut mounted on the saidvthreaded post, and cords passing around the said wheels and means for securing said cords 4adjacenttheir ends to a-support. Y Y ,y

18. In a drafting apparatus, a straightedge, a center casing attached tothe straightedge intermediately of its ends and .provided with a longitudinalslot, end casings attached to each end of the saidstraightedge, grooved wheels mounted inthe lsaid end casings, a movable rectangular plate in the said center casing, 4a grooved 4wheel mounted on a stud inthe said plate and shorter in elevation than the said stud,A a threaded post eXtendingfrom the said stud through the slot in the said centercasing and of smaller diameter than the said stud, a thumb-nut mounted on the'said threaded post, cords passing around theV said `wheels and having their ends adapted lto besecured to a support and posts in the said end casings adjacent to their ends. Y e Y 14. In a drafting apparatus, a drawingboard, a straight-edge thereon, a center casing attached to the straight-edge intermediately of its ends and provided with a longitudinal slot, end `casings attached to each end of the said straight-edge, grooved wheels mountedl in the` said end rcasings,`aY grooved wheelmounted in the said center .,casing, cordsy passing varound the said f adjacent itsupper left-hand corner and passing down to and partly around the outer lefthand wheelpthence down to and partly around the inner left-hand wheel, across the straight-edge to and around the inner right-hand wheel, thence vback to and around the centerwheel, thence up to and vpartly around the outer right-hand Wheel down toward and having its other end adapted to be secured to the lower righthand corner, the other cord Vadapted tobe secured1 adjacent one end to the drawing board adjacent the upper right-hand corner of the board down to and partlyaround the outer right-hand wheel, thence up ytoand partly around the inner right-hand wheel1 across the straight-edge to and around the inner left-hand wheel, thence back to and around the center wheel, thence up to and partly around the outer left-hand wheel down toward and j having its other end adapted to V be vsecured to the lower left-hand corner of the board. y

16. In a drafting apparatus,"a straightedge,center and .end wheelsattached to the said straight-edge, cords passing laround the said wheels, one cord adapted to be` secured adjacent onetend to a drawing board adjacent its upper left-hand corner and passing down to and partly around the outer lefthand;v wheel, thence down to and partly around the, inner left-hand wheel, across thevstraight-edge to and around the inner right-hand wheel, thence back to and around the center wheel, thence up to and partly around `the outer right-handv wheel down .toward and having its other ,end adapted to be secured to the lower right-hand corner, the other cord adapted to be secured adjacent one end to the drawing board adjacent the upper right-hand corner of, theboard down to and partly around the. outer righthand wheel, thence up to and partly around the inner Aright-hand wheel, across the .straight-,edge to and around theinner leftha'nd n'fheehthence back to and around the center wheel,v thence up to and partly around the outer left-hand wheel down towardr and Yhaving its other end adapted to lbe secured to the lower left-hand corner of the board, and means for locking and holding the Asaid straight-edge at a iXed angle.

fl7. In a drafting apparatus,a straightedge, center and end Wheels attachedV to the said straight-edge, Cords passing around the said wheels, one cord adapted to be secured adjacent one end to a drawing board adjacent its upper left-hand corner and passing down to and partly around the outer left-hand wheel, thence down to and partly around the inner left-hand wheel, across the straight-edge to and around the inner right-hand wheel, thence back to and around the center wheel, thence up to and partly around the outer right-hand wheel down toward and having its other end adapted to be secured to the lower righthand corner, the other cord adapted to be secured adjacent one end to the drawing board adjacent the upper right-hand corner of the board down to and partly around the outer right-hand wheel, thence up to and partly around the inner right-hand wheel, across the straight-edge to and around the inner left-hand wheel, thence back to and around the center wheel, thence up to and partly around the outer left-hand wheel down toward and having its other end adapted to be secured to the lower left-hand corner of the board, and means for simultaneously locking and holding the said straight-edge at a fixed angle and permitting the said straight-edge to be readily moved and maintained constantly at the same' angle.

18. In a drafting apparatus, a drafting member, crossed cords adapted to be fixed at their ends and having reversely arranged loops formed therein and cooperative with the respective' ends of said member, and means for inversely varying the lengths of' the respective loops.

19. In a drafting apparatus, a drafting member, a pair of crossed cords adapted to be attached at their ends to a drafting board and having reversely disposed loops formed in their intermediate portions, guiding means on said member cooperative Copies of this patent may be obtained for with the intermediate portions of the cords, and means on said member cooperativo with said loops and adjustable to inversely vary the lengths thereof and thus alter the angle of the drafting member relatively to (he drafting board.

20. In a drafting apparatus, a straight edge, crossed cords adapted to be fixed at their ends to a drafting hoard, and having reversely extending loops formed therein, guiding means at the ends of the straight edge cooperative with said cords, and means cooperative with said loops and shiitable longitiulinally of the straight edge to inversely vary the lengths of the respective loops and thus vary the angle of' the straight edge relatively to the drafting board.

Q1. In apparatus of the character described, cords arranged in crossed relation Y and adapted to be attached at their ends to a support, reversely disposed loops being formed in the intermediate portions of said cords, a member having guiding means at its ends cooperative with said cords at 0pposite sides of the loops therein, and means cooperative with said loops to determine the relative lengths thereot and thereby determine the angular position of said member relatively to the support.

In a drafting apparatus, a straight odge, reversely looped cords the ends of which are adapted to be iixed and the intermediate portions of which coperate with the ends oit' the straight edge, and means for inversely varying the lengths of' the loops in the cords.

In testimony whereof I have aiiixed my signature in the presence of two Witnesses.

ERNEST LORIN FULLER. lVitnesses VILLiAM H. MITCHELL, ANNA DAVIDSON.

ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

